RF Amplifier Layout With Shared Doped Region to Cut Area
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Solution Overview
Problem
Power amplifiers, particularly two-stage cascade amplifiers, occupy a large area and are hindered by wire impedance, which impedes miniaturization and performance improvement.
Innovation Solution
The layout pattern integrates two amplifiers in the same active area, sharing a common doped region without shallow trench isolation, reducing device size and minimizing wire impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If two amplifiers are designed in separate active areas with shallow trench isolation, then device isolation and manufacturing precision are improved, but device area increases and wire impedance increases
Solution Approach 1:
The patent merges two separate active areas into a single shared active area, allowing both amplifiers to coexist without shallow trench isolation. This combining approach reduces the overall device area while maintaining proper signal isolation through layout design and grounding strategies.
Solution Approach 2:
The shared doped region serves multiple functions simultaneously - it acts as the drain for the first amplifier and the source for the second amplifier. This multi-functionality eliminates the need for separate isolation structures and reduces the total device footprint.
2Manufacturing precision
If two amplifiers are designed in separate active areas with shallow trench isolation, then device isolation is improved, but wire impedance increases
Solution Approach 1:
By merging the active areas and sharing the doped region, the physical distance between the amplifiers is minimized. This reduces the length of interconnecting wires and consequently lowers wire impedance, while isolation is maintained through proper layout design.
3Area of stationary object
If amplifiers share a common doped region without shallow trench isolation, then device area is reduced, but manufacturing complexity increases
Solution Approach 1:
The shared active area is segmented into distinct amplifier regions through careful layout design, with the common doped region positioned to serve both amplifiers. This segmentation allows standard manufacturing processes to be used while achieving the area reduction benefits.
4Area of stationary object
If amplifiers are placed closer together to reduce area, then device area is reduced, but signal interference increases
Solution Approach 1:
The common doped region acts as an intermediary structure that enables close placement of amplifiers while maintaining signal integrity. By sharing this region and using appropriate grounding and layout techniques, signal interference is minimized despite the reduced spacing.
Data Source
AI summary
The invention provides a semiconductor layout pattern, which includes a substrate, an active area is defined on the substrate, a plurality of gate structures are located in the active area, and a plurality of doped regions are located in the active area, wherein the plurality of gate structures and doped regions contained in the active area form a first amplifier and a second amplifier, the first amplifier and the second amplifier are connected in series with each other, and a drain doped region of the first amplifier and a source doped region of the second amplifier share the same doped region. The invention has the advantages of saving element space and improving the efficiency of the amplifier.